refactor(data): move Result utility to utils and simplify API

Relocate the Result type from `@/data/result` to `@/utils/result` and
replace the discriminated-union API (`kind`/`value`) with a simpler
boolean-based API (`success`/`data`) across all repositories and
storage classes for improved readability and consistency.

src/data/storage/chat/local_chat_storage.ts

@@ -15,7 +15,7 @@
  * 数据量大时考虑升级 schema 加索引。
  */
 
-import { Result, type Result as ResultT } from "../result";
+import { Result, type Result as ResultT } from "@/utils/result";
 import { LocalChatDB } from "./local_chat_db";
 import { LocalMessage } from "./local_message";
 
@@ -47,9 +47,9 @@ export class LocalChatStorage {
   async init(): Promise<ResultT<void>> {
     try {
       await this.db.open();
-      return Result.success(undefined);
+      return Result.ok(undefined);
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
@@ -58,9 +58,9 @@ export class LocalChatStorage {
   async saveMessage(message: LocalMessage): Promise<ResultT<void>> {
     try {
       await this.db.messages.add(message.toRow());
-      return Result.success(undefined);
+      return Result.ok(undefined);
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
@@ -75,9 +75,9 @@ export class LocalChatStorage {
           }
         },
       );
-      return Result.success(undefined);
+      return Result.ok(undefined);
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
@@ -88,17 +88,17 @@ export class LocalChatStorage {
       const rows = await this.db.messages.toArray();
       // 按 dbId 升序（与 Dart `box.values.toList()` 插入序语义一致）
       rows.sort((a, b) => (a.dbId ?? 0) - (b.dbId ?? 0));
-      return Result.success(rows.map((r) => LocalMessage.fromRow(r)));
+      return Result.ok(rows.map((r) => LocalMessage.fromRow(r)));
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
   async getMessageCount(): Promise<ResultT<number>> {
     try {
-      return Result.success(await this.db.messages.count());
+      return Result.ok(await this.db.messages.count());
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
@@ -110,9 +110,9 @@ export class LocalChatStorage {
         .filter((r) => r.sessionId === sessionId)
         .toArray();
       rows.sort((a, b) => (a.dbId ?? 0) - (b.dbId ?? 0));
-      return Result.success(rows.map((r) => LocalMessage.fromRow(r)));
+      return Result.ok(rows.map((r) => LocalMessage.fromRow(r)));
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
@@ -121,9 +121,9 @@ export class LocalChatStorage {
   async clearAll(): Promise<ResultT<void>> {
     try {
       await this.db.messages.clear();
-      return Result.success(undefined);
+      return Result.ok(undefined);
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
@@ -134,30 +134,30 @@ export class LocalChatStorage {
   async deleteMessage(index: number): Promise<ResultT<void>> {
     try {
       if (!Number.isInteger(index) || index < 0) {
-        return Result.failure(
+        return Result.err(
           new RangeError(`deleteMessage: index ${index} out of range`),
         );
       }
       const rows = await this.db.messages.toArray();
       if (index >= rows.length) {
-        return Result.failure(
+        return Result.err(
           new RangeError(`deleteMessage: index ${index} out of range`),
         );
       }
       const target = rows[index]!;
       await this.db.messages.delete(target.dbId!);
-      return Result.success(undefined);
+      return Result.ok(undefined);
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 
   async close(): Promise<ResultT<void>> {
     try {
       this.db.close();
-      return Result.success(undefined);
+      return Result.ok(undefined);
     } catch (e) {
-      return Result.failure(e);
+      return Result.err(e);
     }
   }
 }